FreshPatents.com Logo
stats FreshPatents Stats
n/a views for this patent on FreshPatents.com
Updated: August 24 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

Follow us on Twitter
twitter icon@FreshPatents

Amoled driving and compensating circuit and method, and amoled display device

last patentdownload pdfdownload imgimage previewnext patent


20140049568 patent thumbnailZoom

Amoled driving and compensating circuit and method, and amoled display device


The present disclosure discloses an AMOLED driving and compensating circuit and method, and AMOLED display device. The driving and compensating circuit comprising: several driving circuits set inside several pixel regions used for driving several AMOLEDs; an external compensating circuit set outside the pixel regions used for eliminating an effect of threshold voltage of a driving thin film transistors in the several driving circuits set inside the several pixel regions on driving currents passing through the driving thin film transistors. The driving and compensating method comprising: storing threshold voltage of the driving thin film transistors of the several driving circuits set inside the several pixel regions; storing grayscale voltage of each of the several driving circuits set inside the several pixel regions; gate voltage of the driving thin film transistor of each of the several driving circuits set inside the several pixel regions jumping to a sum of the threshold voltage and the grayscale voltage of the driving circuit. The display device comprises the AMOLED driving and compensating circuit.
Related Terms: Oled Display Gray-scale Jumping Transistors

Browse recent Boe Technology Group Co., Ltd. patents - Beijing, CN
USPTO Applicaton #: #20140049568 - Class: 345690 (USPTO) -


Inventors: Xiaojing Qi, Tianma Li

view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20140049568, Amoled driving and compensating circuit and method, and amoled display device.

last patentpdficondownload pdfimage previewnext patent

TECHNICAL FIELD

The present disclosure relates to AMOLED field, in particular to an AMOLED driving and compensating circuit and method, and AMOLED display device.

BACKGROUND

Active Matrix Organic Light Emitting Diode (AMOLED) can emit light, when the AMOLED is driven by a driving current produced from a driving thin film transistor in a driving circuit. However, as the change of time, threshold voltage of the driving thin film transistor may change. As a result, when the same grayscale voltage is input, the driving current produced is inconsistent, such that luminance of the driven AMOLED is different. At present, a major method for solving the problem is to add a compensating circuit to eliminate an effect of the threshold voltage, so as to achieve a consistent driving current and improve luminance uniformity of the AMOLED.

In a process of implementing the present disclosure, the inventor finds that the prior art has at least the below problem:

The existing AMOLED compensating circuit often needs five or six thin film transistors to be set inside the same pixel region, which thus may reduce aperture ratio.

SUMMARY

An embodiment of the present disclosure provides an AMOLED driving and compensating circuit and method, and AMOLED display device, being capable of increasing aperture ratio.

According to the embodiment of the present disclosure, provided is an AMOLED driving and compensating circuit, comprising:

Several driving circuits set inside several pixel regions used for driving several AMOLEDs, wherein one AMOLED and one corresponding driving circuit are set inside each of pixel regions, and one driving circuit is used for driving one corresponding AMOLED;

An external compensating circuit set outside the pixel regions used for eliminating an effect of threshold voltage of driving thin film transistors in the several driving circuits set inside the several pixel regions on driving currents passing through the driving thin film transistors.

In one example, each of the several driving circuits set inside the several pixel regions comprising: a first thin film transistor, a driving capacitor and a driving thin film transistor;

The first thin film transistor has a source connected to a data line;

The driving capacitor has a first terminal connected to a drain of the first thin film transistor; and

The driving thin film transistor has a gate connected to the drain of the first thin film transistor,

Wherein an input terminal of the AMOLED corresponding to the driving circuit is connected to an output terminal of operating voltage, and an output terminal of the AMOLED corresponding to the driving circuit is connected to a drain of the driving thin film transistor;

The first thin film transistor and the driving thin film transistor are n-channel thin film transistors;

In one example, the external compensating circuit set outside the pixel regions comprises: a second thin film transistor, a third thin film transistor, a compensating capacitor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor and a seventh thin film transistor;

The second thin film transistor has a source connected to ground, a gate connected to a second clock signal output terminal, and a drain connected to a second terminal of the driving capacitor;

The third thin film transistor has a source connected to the drain of the second thin film transistor, and a gate connected to the second clock signal output terminal;

The compensating capacitor has a first terminal connected to a drain of the third thin film transistor;

The fourth thin film transistor has a source connected to a second terminal of the compensating capacitor, a gate connected to the second clock signal output terminal, and a drain connected to a source of the driving thin film transistor;

The fifth thin film transistor has a source connected to ground, a gate connected to a first clock signal output terminal, and a drain connected to the source of the fourth thin film transistor;

The sixth thin film transistor has a source connected to a reference voltage output terminal, a gate connected to the first clock signal output terminal, and a drain connected to the drain of the second thin film transistor;

The seventh thin film transistor has a source connected to the reference voltage output terminal, a gate connected to the first clock signal output terminal, and a drain connected to the gate of the driving thin film transistor; and

A gate of the first thin film transistor is connected to the second clock signal output terminal,

Wherein the second thin film transistor, the sixth thin film transistor and the seventh thin film transistor are n-channel thin film transistors;

The third thin film transistor, the fourth thin film transistor and the fifth thin film transistor are p-channel thin film transistors.

In one example, both a first clock signal at the first clock signal output terminal and a second clock signal at the second clock signal output terminal comprise a first phase, a second phase and a third phase;

At the first phase, the first clock signal output terminal is at high level, and the second clock signal output terminal is at low level;

At the second phase, the first clock signal output terminal is at low level, and the second clock signal output terminal is at high level;

At the third phase, the first clock signal output terminal is at low level, and the second clock signal output terminal is at low level.

In one example, at the first phase, the third thin film transistor, the fourth thin film transistor, the sixth thin film transistor and the seventh thin film transistor in the external compensating circuit turn on, and the first thin film transistor in each of the driving circuits and the second thin film transistor and the fifth thin film transistor in the external compensating circuit turn off, such that voltage difference over the compensating capacitor becomes the threshold voltage of the driving thin film transistor;

At the second phase, the third thin film transistor, the fourth thin film transistor, the sixth thin film transistor and the seventh thin film transistor in the external compensating circuit turn off, and the first thin film transistor in each of the driving circuits and the second thin film transistor and the fifth thin film transistor in the external compensating circuit turn on, such that the voltage difference over the driving capacitor in each of the driving circuits becomes a grayscale voltage input from a data line corresponding to the driving circuit; and

At the third phase, the third thin film transistor, the fourth thin film transistor, and the fifth thin film transistor in the external compensating circuit turn on, and the first thin film transistor in each of the driving circuits and the second thin film transistor, the sixth thin film transistor and the seventh thin film transistor in the external compensating circuit turn off, such that the gate voltage of the driving thin film transistor in the driving circuit jumps to a sum of the threshold voltage of the driving thin film transistor and the grayscale voltage input from the data line corresponding to the driving circuit.

According to an embodiment of the present disclosure, further provided is an AMOLED driving and compensating method, comprising:

A first phase, storing a threshold voltage of driving thin film transistors of several driving circuits set inside several pixel regions;

A second phase, storing a grayscale voltage of each of the several driving circuits set inside the several pixel regions;

A third phase, a gate voltage of the driving thin film transistor of each of the several driving circuits set inside the several pixel regions jumping to a sum of the threshold voltage and the grayscale voltage of the driving circuit.

In one example, at the first phase, storing the threshold voltage of the driving thin film transistors of the several driving circuits set inside the several pixel regions is:

A first clock signal output terminal is at high level, a second clock signal output terminal is at low level, a third thin film transistor, a fourth thin film transistor, a sixth thin film transistor and a seventh thin film transistor in a compensating circuit turn on, a first thin film transistor in each of the driving circuits and a second thin film transistor and a fifth thin film transistor in the compensating circuit turn off, and voltage difference over a compensating capacitor becomes the threshold voltage of the driving thin film transistors of the several driving circuits set inside the several pixel regions;

At the second phase, storing the grayscale voltage of each of the several driving circuits set inside the several pixel regions is:

The first clock signal output terminal is at low level, the second clock signal output terminal is at high level, the third thin film transistor, the fourth thin film transistor, the sixth thin film transistor and the seventh thin film transistor in the compensating circuit turn off, the first thin film transistor in each of the driving circuits and the second thin film transistor and the fifth thin film transistor in the compensating circuit turn on, and the voltage difference over the compensating capacitor in each of the driving circuits becomes the grayscale voltage input from the data line corresponding to the driving circuit;

At the third phase, the gate voltage of the driving thin film transistor of each of the several driving circuits set inside the several pixel regions jumping to the sum of the threshold voltage and the grayscale voltage of the driving circuit is:

The first clock signal output terminal is at low level, the second clock signal output terminal is at low level, the third thin film transistor, the fourth thin film transistor and the fifth thin film transistor in the compensating circuit turn on, the first thin film transistor in each of the driving circuits and the second thin film transistor, the sixth thin film transistor and the seventh thin film transistor in the compensating circuit turn off, and the gate voltage of the driving thin film transistor in each of the several driving circuits set inside the several pixel regions jumps to the sum of the threshold voltage and the grayscale voltage of the driving circuit.

A display device comprising the AMOLED driving and compensating circuit.

The AMOLED driving and compensating circuit and method provided in the embodiment of the present disclosure, due to an external compensating circuit set outside pixel regions, is capable of simultaneously compensating threshold voltage of driving thin film transistors of several driving circuits inside the pixel regions, and there is only a driving circuit used for driving the AMOLED in each of the pixel regions, so that aperture ratio is increased.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly specify the technical solution in the embodiment of the present disclosure or the prior art, below will be a brief introduction of drawings needed to be used in descriptions of the embodiment or the prior art. Obviously, the drawings in the below descriptions are merely some embodiments of the present disclosure. For those ordinarily skilled in the art, they may obtain other drawings in the light of these drawings, without paying any inventive labor.

FIG. 1 is a circuit diagram of an AMOLED driving and compensating circuit provided in the embodiments of the present disclosure;

FIG. 2 is a timing sequence diagram of the clock signal of the circuit in FIG. 1;

FIG. 3 is an equivalent circuit diagram of the circuit in FIG. 1 at a first phase;

FIG. 4 is an equivalent circuit diagram of the circuit in FIG. 1 at a second phase;

FIG. 5 is an equivalent circuit diagram of the circuit in FIG. 1 at a third phase;

FIG. 6 is a circuit diagram of another AMOLED driving and compensating circuit provided in the embodiments of the present disclosure;



Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Amoled driving and compensating circuit and method, and amoled display device patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Amoled driving and compensating circuit and method, and amoled display device or other areas of interest.
###


Previous Patent Application:
Image processing apparatus, image processing method, and program
Next Patent Application:
Display apparatus and display-apparatus driving method
Industry Class:
Computer graphics processing, operator interface processing, and selective visual display systems
Thank you for viewing the Amoled driving and compensating circuit and method, and amoled display device patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 0.54657 seconds


Other interesting Freshpatents.com categories:
Medical: Surgery Surgery(2) Surgery(3) Drug Drug(2) Prosthesis Dentistry  

###

Data source: patent applications published in the public domain by the United States Patent and Trademark Office (USPTO). Information published here is for research/educational purposes only. FreshPatents is not affiliated with the USPTO, assignee companies, inventors, law firms or other assignees. Patent applications, documents and images may contain trademarks of the respective companies/authors. FreshPatents is not responsible for the accuracy, validity or otherwise contents of these public document patent application filings. When possible a complete PDF is provided, however, in some cases the presented document/images is an abstract or sampling of the full patent application for display purposes. FreshPatents.com Terms/Support
-g2-0.233
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20140049568 A1
Publish Date
02/20/2014
Document #
13805505
File Date
09/26/2012
USPTO Class
345690
Other USPTO Classes
345 82
International Class
09G3/32
Drawings
5


Oled Display
Gray-scale
Jumping
Transistors


Follow us on Twitter
twitter icon@FreshPatents